I got the coloring book and I must say the art is far less cartoonish than the ATLA one but there are still some rather interesting pieces like:

- Tenzin playing with his kids and his airbender hood is up.- Korra's muscles as she is bloodbent by Tarrlok. I'm serious, the way the tense muscles were drawn was rather good.- Slightly silly comic book inspired page where Asami fights her dad in the mechs. Basically, the entire page has the two mechs clashing with each other but in one corner, there's a bubble with Asami's face while in the other corner, there's a bubble with Hiroshi's face.- An x-ray view of Varrick sitting on Zhu Li's shoulders inside the platypus-bear suit while Zhu Li's legs are knee deep in wads of cash.- Vaatu has a lot of tendrils coming out from his back for some reason... I don't remember that in the show.- The Red Lotus are drawn like they're on the cover of a superhero comic.- I feel they should not have put in this page in the comic but there's one featuring Lin sneaking up behind P'li for the impending death scene while there's a bubble of Zaheer going =O in the corner.- A fairly gaunt Korra as she learns to walk in Book 4. I was shocked by how thin her arms were drawn for that scene.- Hiroshi's death scene. Basically the giant hand is about the swat the hummingbird suit and there's Asami being jettisoned out of the suit on one side while the opposite side has a bubble of Hiroshi looking very determined and serious. I guess we know how Hiroshi looked like when he was about to die...- Not surprisingly, the last page is a Korrasami piece but it is not the one of them inside the portal. It's both of them in the Spirit World as they look at the spirits around them. Interestingly enough, Asami looks fairly masculine here and I almost missed seeing her ponytail at first glance.